KeyPlex 350


Note: product analysis and/or label may differ depending on State or Country regulations.

KeyPlex 350

Our most popular product for general use on a wide variety of row and tree crops. With a balanced formulation of secondary and micronutrients this product is sufficient for maintaining most crops free of nutrient deficiency symptoms.

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KeyPlex 350 will aid in the prevention of certain plant diseases when applied as a foliar spray, such as postbloom fruit drop and greasy spot diseases of citrus, and bacterial leaf spot of tomatoes.


It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. Do not apply this product in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your State or Tribe, consult the agency responsible for pesticide regulation.


Use this product only in accordance with its labeling and with the Worker Protection Standard, 40 CFR Part 170. This Standard contains requirements for the protection of agricultural workers on farms, forests, nurseries, and greenhouses, and handlers of agricultural pesticides. It contains requirements for training, decontamination, notification, and emergency assistance. It also contains specific instructions and exceptions pertaining to the statements on this label about personal protective equipment (PPE), and restricted-entry interval. The requirements in this box only apply to uses of this product that are covered by the Worker Protection Standard.
Do not enter or allow worker entry into treated areas during the restricted entry interval (REI) of 4 hours. PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves contact with anything that has been treated, such as plants, soil or water, is: Coveralls • Shoes plus Socks • Waterproof Gloves


These requirements apply to uses of this product that are NOT within the WPS for agricultural pesticides (40 CFR Part 170). The WPS applies when this product is used to produce agricultural plants on farms, forests, nurseries, or greenhouses. For non-agricultural uses, do not enter treated areas without protective clothing until spray has dried.


KeyPlex 350 is a formulation of micronutrients most often found deficient in commercial crops and trees. It contains alpha-keto acids, which facilitate utilization of micronutrients, and increase resistance to environmental stress.

KeyPlex 350 will elicit production of defensive proteins in certain plants. KeyPlex 350 will aid in the prevention of certain plant diseases such as post-bloom fruit drop and greasy spot diseases of citrus, and bacterial leaf spot of tomatoes. For disease control, apply foliar sprays of KeyPlex 350 in sufficient water to obtain adequate coverage.

KeyPlex 350 is formulated for foliar application or fertigation to prevent and correct micronutrient deficiencies when used as directed. Maintaining proper levels of micronutrients usually results in increased plant vigor, better yields, superior fruit size and quality, and longer shelf life.


Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many equipment and weather – related factors determine the potential for spray drift. The applicator and the grower are responsible for considering all these factors when making decisions.


KeyPlex 350, when added to the spray tank water, will lower the water pH, and can be used in combination with other pesticides. However, in unfamiliar mixtures use a “jar compatibility” test using proper proportions of chemicals and water.


Application Rates for Crops and Turf

Crop Quarts/Acre Crop Quarts/Acre
Tomatoes 1 to 2 * Other Vegetables 1 to 2 *
Small Fruits 1 to 2 * Peanuts 1 to 2 *
Cotton 1 to 2 * Tobacco 1 to 2 *
Other Field Crops 1 to 2 * Turf 1 to 2 *
Citrus 2 to 3 * Tropical Fruits 2 to 3 *
Peaches 2 to 3 * Other Deciduous 2 to 3 *
Pecans 2 to 3 * Other Tree Nuts 2 to 3 *


*Addition of 3 to 5 pounds of Urea or Potassium nitrate per 100 gallons of water will aid leaf assimilation.

Citrus: Apply 2 to 3 quarts per acre as a foliar spray. If a pre-bloom application is made, apply 2 to 3 quarts per acre. Repeat applications at petal fall and make one or two summer sprays as needed. The summer sprays should be applied with summer oil. Tank mix KeyPlex 350 with summer oil and apply the oil at the manufacturer’s recommended rate of application. Thorough Spray coverage of plant foliage is essential. Vegetables including Pepper and Tomato: Apply 1 to 2 quarts per acre starting at the 4-6 leaf stage. Two applications should be applied prior to bloom followed by at least four applications after bloom, as needed. Apply at least six applications to tomatoes and peppers. At least six applications are also recommended on other vegetables. KeyPlex 350 can either be applied as a foliar spray or by fertigation (low volume irrigation). For foliar spray applications, thorough coverage of the foliage is essential.

For other crops and turf refer to table for use rates: For other crops apply one foliar application before bloom, and at least two foliar applications after bloom, as needed. For annual crops, apply the first application at the 4-6 leaf stage. Thorough spray coverage of the plant foliage is essential.

AERIAL APPLICATION: Use 1 to 3 quarts of KeyPlex 350 per acre in at least 15 gallons of water per acre.

APPLICATION RATES FOR ORNAMENTAL PLANTS: Use 1 quart of KeyPlex 350 per 100 gallons of water. Addition of 1 to 2 pounds of urea or potassium nitrate per 100 gallons of water will aid leaf penetration.

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